Hitachi Compute Blade 500 Series Function Manual

LAN Advanced Functions 2-3
Hitachi Compute Blade 500 Series LAN Advanced Function Manual (for Intel)
Adapter Fault Tolerance
The AFT function provides the fault tolerance for LAN devices between the system
equipment and the network. The function makes one team with using two LAN
devices, one for active connection (Primary LAN device) and the other for backup
(Secondary LAN device).
The AFT function transmits and receives a probing packet (Broadcast Packet
compliant with the Intel® proprietary specification) as heartbeat between Primary
LAN device and Secondary LAN device. The AFT function monitors the link state
between the Primary LAN device and the switching HUB for active connection and the
transmission and reception state of the probing packet between LAN devices. Even if
the link for the Primary LAN device is disconnected to disable transmission or receive
of the probing packet, the AFT function failover all the traffic (including the MAC
address and the IP address) to the link for the Secondary.
Probing packet is enabled by default for the use of the AFT function. If it is
impossible to normally transmit or receive Probing packet in heavy traffic
network, it might repeat to failover and failback between Primary LAN device and
Secondary LAN device. In such a case, disable the probing packet. See "How to
Disable Monitoring Packet (AFT/ALB)".
When using the AFT function, connect the two LAN devices to the same switching
HUB.
When the AFT function is used, LAN device priorities (Primary and Secondary)
are not defined by default. See How to set LAN device priorities, for details.
Primary LAN device
Secondary LAN device

Hitachi Compute Blade 500 Series Specifications

General

Brand	Hitachi
Model	Compute Blade 500 Series
Category	Server
Language	English